What it would take for the US to make cellphones is direct subsidy to the (inefficient, and for that reason likely therefore doomed by the market without artificial support, since there is robust competition) US firms doing so.
Of course, not only would this cost the amount of the subsidy, but the amount of the lost opportunities in places where the US has comparative advantages foregone to provide the subsidy.
The question then is why would you want to do this?